How to use the Online Abacus
The online abacus lets you slide beads to count from 1 to 50 and shows how an abacus represents numbers.
The formula
Each rod holds ten beads. Beads slid to one side are counted; the others are not.
Worked example
Slide 7 beads on the first rod and 3 on the second to show 7 + 3 = 10 beads.
Tips for better results
- Use it to teach counting to children.
- Try Reset and Fill buttons to start fresh.
Common mistakes to avoid
- Counting beads on the wrong side.
- Mixing it up with a place-value (soroban) abacus.
Please note: Results are estimates for general use. For safety-critical work such as electrical or building projects, check with a qualified professional and local codes. See our Disclaimer.